Automatic merge from submit-queue

PodWorkers UpdatePod takes options struct

First commit from https://github.com/kubernetes/kubernetes/pull/24843 

Second commit:
The `PodWorkers.UpdatePod` operation is updated as follows:
* use options struct to pass arguments
* add a pod status func to allow override status
* add pod termination grace period if sync operation requires a kill pod
* add a call-back that is error aware

Third commit:
Add a `killPodNow` to kubelet that does a blocking kill pod call that properly integrates with pod workers.

The plan is to pass `killPodNow` as a function pointer into the out of resource killer.

```
// KillPodFunc kills a pod.
// The pod status is updated, and then it is killed with the specified grace period.
// This function must block until either the pod is killed or an error is encountered.
// Arguments:
// pod - the pod to kill
// status - the desired status to associate with the pod (i.e. why its killed)
// gracePeriodOverride - the grace period override to use instead of what is on the pod spec
type KillPodFunc func(pod *api.Pod, status api.PodStatus, gracePeriodOverride *int64) error
```

You can see it being used here in the WIP out of resource killer PR.

https://github.com/kubernetes/kubernetes/pull/21274/commits/1344f858fba956c285eba6c418a3008576cd3843#diff-92ff0f643237f29824b4929574f84609R277

/cc @vishh @yujuhong @pmorie